Double torsion coil spring



FIG. 1 is a perspective view of a double torsion coil spring showing my new design

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a plan/inverted plan view

FIG. 5 is a right side view; and,

FIG. 6 is a left side view. 

The ornamental design for a double torsion coil spring, as shown and described. 